<template>
    <div>
         <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
             <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
                <el-alert
                    title="注意：只允许为第三级分类设置相关参数"
                    type="warning" :closable="false" show-icon>
                </el-alert>
            <!-- 选择商品分类区 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联 -->
                      <el-cascader
                        v-model="selectedCateKeys"
                        :options="cateList"
                        expand-trigger="hover"
                        :props="cateProps"
                        @change="handleChange"></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many" 
            >
                <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                @click="addDialogVisible = true">
                    添加参数
                </el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" 
                            :key="i" closable
                            @close="handleClose(i,scope.row)">
                                {{item}}
                            </el-tag>

                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                @click="addDialogVisible = true">
                    添加属性                </el-button>
                    <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" 
                            :key="i" closable
                            @close="handleClose(i,scope.row)">
                                {{item}}
                            </el-tag>

                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
        </el-card>

        <!-- 添加参数对话框 -->
        <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <!-- 添加参数对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog
        :title="'修改' + titleText"
        :visible.sync="eidtDialogVisible"
        width="50%" @close="eidtDialogClosed">
        <!-- 添加参数对话框 -->
        <el-form :model="eidtForm" :rules="eidtFormRules" ref="eidtFormRef" 
        label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="eidtForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="eidtDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="eidtParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return {
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单
            addForm:{
                attr_name:''
            },
            // 添加表单的数据验证对象
            addFormRules:{
                attr_name:[{
                    required:true,
                    message:'请输入参数名称',trigger:'blur'
                }]
            },
            // 控制修改对话框显示与隐藏
            eidtDialogVisible:false,
            // 修改的表单数据对象
            eidtForm:{},
            // 修改表单的验证规则
            eidtFormRules:{
                attr_name:[{
                    required:true,
                    message:'请输入参数名称',trigger:'blur'
                }]
            },
            eidtDialogVisible:false,
            // 控制按钮与文本框切换显示
            inputVisible:false,
            // 文本框中输入的内容
            inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
         async getCateList(){
        // 获取所有的商品分类列表
            const {data:res} = await this.$http.get('categories')

            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败');
            }

            this.cateList=res.data

            console.log(this.cateList)
        },
        // 级联选择框中项变化，会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },
        // 获取参数列表参数
        async getParamsData(){
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 选中的是三级分类
            console.log(this.selectedCateKeys)
            // 根据所选分类的Id,和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params:{sel:this.activeName}})

            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败');
            }

            res.data.forEach(item =>{
                item.attr_vals =  item.attr_vals?
                item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })

            console.log(res.data)
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加参数
         addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败');
                }

                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
            
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`
            ,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                    return this.$message.error('获取参数信息失败');
                }
            this.eidtForm = res.data
            this.eidtDialogVisible =true
        },
        // 重置修改的表单
        eidtDialogClosed(){
            this.$refs.eidtFormRef.resetFields()
        },
        eidtParams(){
            this.$refs.eidtFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.eidtForm.attr_id}`,
                {attr_name:this.eidtForm.attr_name,attr_sel:this.activeName})

                if(res.meta.status!==200){
                    return this.$message.error('修改信息失败');
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.eidtDialogVisible = false
            })
        },
        // 根据ID删除对应的参数项目
        async removeParams(attr_id){
           const confirmResult =  await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }
        ).catch(err=>err)

        // 用户取消了删除操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除！')
        }

        // 删除业务的逻辑
        const {data:res} =  await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            return this.$message.error('删除参数失败');
        }
        this.$message.success("删除参数成功！")
        this.getParamsData()
     },
    //  文本框焦点
    async handleInputConfirm(row){
        if(row.inputValue.trim().length===0){
            row.inputValue =''
            row.inputVisible = false
            return 
        }

        // 如果没有return则证明输入的内容需要后续处理

        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible = false
        // 需要发起请求保存此次操作
        this.saveAttrVals(row)
    },
    // 点击按钮展示文本输入框
    showInput(row){
        row.inputVisible = true
        // 让文本框自动获得焦点
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals(row){
         // 需要发起请求保存此次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`
        ,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')
        })

        if(res.meta.status!==200){
            return this.$message.error('修改失败')
        }

        this.$message.success('修改参数项成果！')
    },
    // 删除对应的参数可选项
    handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
    }
},
    computed:{
        // 如果按钮需要被禁用则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }

            return false
        },
        // 当前选中的三级分类的ID
        cateId(){
             if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px;
    }
    .el-tag{
        margin:10px
    }
    .input-new-tag{
        width: 120px;
    }
</style>